[Question] How to rank keyword on a service website ?

Hey guys!
I have a website where I sell online seo service on it.
My website have a home page, some category page and some product pages. It doesn't contain any blog.

I would like to know, how I am suppose to rank a keyword, if I don't have anything to post daily or weekly in a blog.

If I look for example at a bigger website in the same niche, it has multiple ranked 1 keywords (around 10). It has only 5 category page where you can order directly the service (without for example 5 product page), a terms of service, privacy policy, things like that, and it has also no blog.

I was looking for a couple of their ranked keywords but I can't find them anywhere on their website.

How does it work when you want to rank a keyword for a selling service website?

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